Heat-storing compound.



UNITED STATES PATENT OFFICE.

runnniuc o'rro srmssn, or BROOKLYN, new YORK.

HEAT-STORING oompouuo.

Patented Feb. 6,1906.

Application filed August 28, 1905. Serial No- 276,293-

To 0035 whom it may concern.-

Be it known that LFREDERIG O'r'ro SPIESKE, a subl lect of the German Emeror, residing at Broo lyn, in the county of ings and State of New York,have invented new and useful Improvements in Heat-Storing Compounds, ofwhich the following is a specification.

This invention relates to improvements in heat-storing com ounds, suchas consist principally of crystalline salts possessing the ability toabsorb heat while being reduced from a crystalline to a liquid conditionand to give forth heat when returning from should to a crystallinecondition. Heat-storing compounds of the character indicated are usuallyemployed in various warming devices, such as rubber bags, food-warmers,carriage-lieu ters, &c. The customary procedure is to place theheat-storing compound while in iquid condition in a soft-rubber bag, orpillow. When it is desired to induce the generation of heat, any old andwell-known operation -such, for example, as removing the stopper of thebag or pillow and replacing: it as soon as its temperature haschanged-4s resorted to for starting recrystallization of theheat-storing compound.

One of the principal objections of the heatstoring com ounds in generaluse is that they reduce sue 1 hard crystals in the soft-rubber a orillow for medical )urposes that not onfyist e patient subjectedfrequently to discomfort, but also the bag or pillow is damaged. It hasbeen proposed heretofore to prevent the formation of hard crystals bymixing with the acetate of soda or other heatstoring salt anon-crystalline substance such, for example, as glvcerin, extract ofsunflower-seed or of Greek hay-seed, and the like. The princi alobjection to the addition of non-crysta inc substances of the characterindicated is that in order to produce a soft crystal it is necessary toadd so great a proportion of the non-crystalline substance that theheat-storing salt is deprived of a rest part of its heat-storing proerty. li the quantity of non-crystalline su bstance be decreased, so asto prevent the same from seriously allecting the action of theheat-storing salt, it is found in practice that the acetate of soda orother salt forms generally into sharp needle-shaped crystals, which aresullieiently hard to dam age the soft-rubber bag or pillow, as well asto cause discomfort to the patient. A further objection to the additionof noncrystelline substances of the character indities of the compoundand without ap reciably increasing the cost of the eompoun or causing itto injure the soft-rubber bag, pillow, or other receptacle; furthermore,to secure a longer heat-imparting capacity than in any other compoundused for similar purposes.

In order to accomplish the object set forth, I depart radically from themethods heretofore devised to produce a soft crystal by discarding theuse of non-crystalline substances of the character indicated or ofpoisonous cl' \'slalline salts and employin a non-poisom ous crystallinesubstance. The soft crystalline non-poisonous substance which I preferto combine with the heat-storing crystal in order to induce theformation of crystals which will he su'lliciently soft to preventserious iuj cry to the indie-rubber receptacle and to secure the longheat-imparting capacity is chlorid of calcium.

By reason of the fact that the chlorid of calcium such as employed costsbut little the improved heat-storing compound of this invention iscomparatively inexpensive to produce and costs less than any otherthermophoric mixture or heat-storing com ound. urthermore, it is foundin practice t lat the improved compound of this invention, consisting,as it does, of only nonpoisonous crystalline substances, does not menacethe health of the user nor in'uriously affect the rece tools in which itis laced.

hile the addition of t e chlorid of calcium or other suitable softcrystalline substance to the sodium acetate, sodium hyposulfite, orother suitable heat-storing salt m sulliciently large quantities toproduce a comparatively soft crystal does not materially afi'ect theheat-storing qualities of the sodium acetate and the like, it is foundin practice that by adding a larger quantity of the soft crystallinesubstance than is actually needed to produce a soft crystal theheat-storing quality of the sodium acetate or similar ingredient can bemodified at will to produce any desired temperature in the bag, pillow,or other recepta lIO - has been ole-that is to as by way of example, ifthe tern ature. of e compound consisting of a soil d rystallinesubstance, such as chlond of calcium and a heat-storing s ubstance whenmixed in suitable proportlon 1e55 centigrade and it is desired toproduce a lower tem ature a much larger pro ortion of the c orid ofcalcium, which Is evoid of heat storing properties can be mixed with thesodium acetate or the like, it being understood that in order to lowerthe tem rature as indicated a larger proportion of t e chlorid ofcalcium than is actually needed to produce a soft ci'ystadl in theheat-storing compound is emp o e v am aware that a heat-storing compoundreduced heretofore by the use of acetate 0 lead,and I make no claimthereto. Acetate of lead is ob'ectionable because of its poisonousnature. y invention residesin the combination, with a heat storing salt,of a a nonoisonous soft crystalline substance-- such, or example, aschlorld. of calclum.

Having described the invention, what is claimed as new isz 5 l. Aheat-etc compound consisting of acetate of soda an chlond of calcium.

2. A heat-ate com und consisting of acetate of soda, 0 orid 0 calciumand hypos'ulfite of soda. 3o

3. A heat-storing com ound consisting of a heat-storing salt, and c oridof calcium.

4. A heat-storing compound consisting of a heat-storing salt and anon-poisonous, soft, crystalline substance, adapted to cause theformation of a comparatlvel soft crystal and to regulate the amount ofeat to be generated by the compound without producing a poisonousmixture.

In testimony whereof I aflix my signature 40 in presence of twowitnesses.

FREDERIC OTTO SPIESKE. Witnesses:

James F. DUHAMEL, W. H. CLABKE.

